(CNN) – Among a slate of battleground state polls showing a tightening race between Mitt Romney and President Barack Obama is a survey in Pennsylvania, where Obama, until recently, held a lead over his rival but is now statistically tied with the GOP nominee.

The poll, from Siena College, showed Obama with the backing of 43% of likely Pennsylvania voters, compared to 40% who backed Romney. That's within the 4.2% sampling error. Another 12% of likely Pennsylvania voters in the Siena poll remained undecided. The survey was conducted October 1-5, partially before and partially after the first presidential debate between Obama and Romney, which took place October 3.FULL POST

(CNN) – Pivoting from a sarcastic Big Bird ad released Tuesday morning, President Barack Obama's campaign put out a more serious television spot in the afternoon, this time painting Mitt Romney as a threat to nursing homes.

The 30-second commercial, "Only Choice," attacks Romney's plan to block-grant Medicaid and allow states to manage the system, rather than the federal government.FULL POST

(CNN) - On the day that both presidential candidates are campaigning in Ohio, a new poll indicates a close contest in the race for the Buckeye State's 18 electoral votes.

According to a CNN/ORC International poll (PDF), 51% of likely voters in Ohio say they're backing President Barack Obama, with 47% supporting Republican nominee Mitt Romney. Obama's four point advantage is within the poll's sampling error.FULL POST

(CNN) – Tuesday is the last day for residents of several states, including a number of key electoral battlegrounds, to register to vote.

Voters in Colorado, Florida, Ohio, Pennsylvania and Michigan have until Tuesday to register by mail or in person. Other states with cutoffs Tuesday are Arizona, Arkansas, Georgia, Illinois, Indiana, Kentucky, Louisiana, Utah, Texas, New Mexico and Montana.FULL POST

Washington (CNN) - Three new national polls of likely voters released in the past 24 hours indicate the race for the White House is all knotted up and suggest that Republican presidential nominee Mitt Romney got a bounce out of last Wednesday's first presidential debate.

According to a CNN Poll of Polls that averages all three non-partisan, live operator surveys, Romney has the support of 48% of likely voters, with President Barack Obama at 47%. While the CNN Poll of Polls does not have a sampling error, the margin is well within the sampling error of the three surveys averaged into the CNN Poll of Polls.FULL POST